640700283 has 8 divisors (see below), whose sum is σ = 855649600. Its totient is φ = 426442248.

The previous prime is 640700279. The next prime is 640700299. The reversal of 640700283 is 382007046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640700283 - 2² = 640700279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640700283.

It is not an unprimeable number, because it can be changed into a prime (640700383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170653 + ... + 174366.

It is an arithmetic number, because the mean of its divisors is an integer number (106956200).

Almost surely, 2^640700283 is an apocalyptic number.

640700283 is a deficient number, since it is larger than the sum of its proper divisors (214949317).

640700283 is a wasteful number, since it uses less digits than its factorization.

640700283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345641.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 640700283 is about 25312.0580554012. The cubic root of 640700283 is about 862.0880768561.

The spelling of 640700283 in words is "six hundred forty million, seven hundred thousand, two hundred eighty-three".